The following message was sent to the matts_arxiv list by Matthew Davis <mdavis_at_physics.uq.edu.au>
Hi all,
Sorry for the lateness of this week's email, lectures took priority
unfortunately. This week I am trialling sorting the papers into new and
resubmitted sections. There were 26 new papers last week (I am going to be
interested to see how this number fluctuates.)
Home page: http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/
New abstracts:
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Paper: cond-mat/0609583
Date: Fri, 22 Sep 2006 16:08:07 GMT (25kb)
Title: Merging of single-particle levels in finite Fermi systems
Authors: V.A.Khodel, J.W.Clark, Haochen Li, M.V.Zverev
Comments: 4 pages, 2 figures
Subj-class: Strongly Correlated Electrons
\\
Properties of the distribution of single-particle levels adjacent to the
Fermi surface in finite Fermi systems are studied, focusing on the case in
which these levels are degenerate. The interaction of the quasiparticles
occupying these levels lifts the degeneracy and affects the distance between
the closest levels on opposite sides of the Fermi surface, as the number of
particles in the system is varied. In addition to the familiar scenario of
level crossing, a new phenomenon is uncovered, in which the merging of
single-particle levels results in the disappearance of well-defined
single-particle excitations. Implications of this finding are discussed for
nuclear, solid-state, and atomic systems.
\\ ( http://arXiv.org/abs/cond-mat/0609583 , 25kb)
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Paper: cond-mat/0609587
Date: Fri, 22 Sep 2006 17:18:09 GMT (329kb)
Title: Travelling to exotic places with ultracold atoms
Authors: M. Lewenstein, A. Kubasiak, J. Larson, C. Menotti, G. Morigi, K.
Osterloh, and A. Sanpera
Comments: 11 pages, 4 figures. The following article has been submitted to the
Proceedings of ICAP-2006 (Innsbruck)
Subj-class: Other
\\
We review and speculate on two recent developments of quantum optics and
ultracold atoms. First, we discuss a possible realization of "phonon" physics,
or as we call it "refracton" physics with optical lattices. To this aim we
combine the physics of cold atoms with cavity QED, and investigate
superfluid-Mott insulator quantum phase transition. The systems can exhibit
cavity mode modifications due to local changes of refraction index
("refractons"). Second, we discuss the physics of strongly correlated particles
in Abelian, and more interestingly in non-Abelian magnetic fields, using cold
atoms.
\\ ( http://arXiv.org/abs/cond-mat/0609587 , 329kb)
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Paper: physics/0609196
Date: Fri, 22 Sep 2006 19:45:34 GMT (644kb)
Title: Detection of radio frequency magnetic fields using nonlinear
magneto-optical rotation
Authors: M. P. Ledbetter, V. M. Acosta, S. M. Rochester, D. Budker, S.
Pustelny, V. V. Yashchuk
Comments: 6 pages, 6 figures
Subj-class: Atomic Physics
\\
We describe a room-temperature alkali-metal atomic magnetometer for detection
of small, high frequency magnetic fields. The magnetometer operates by
detecting optical rotation due to the precession of an aligned ground state in
the presence of a small oscillating magnetic field. The resonance frequency of
the magnetometer can be adjusted to any desired value by tuning the bias
magnetic field. We demonstrate a sensitivity of $100\thinspace{\rm
pG/\sqrt{Hz}\thinspace(RMS)}$ in a 3.5 cm diameter, paraffin coated cell. Based
on detection at the photon shot-noise limit, we project a sensitivity of
$20\thinspace{\rm pG/\sqrt{Hz}\thinspace(RMS)}$.
\\ ( http://arXiv.org/abs/physics/0609196 , 644kb)
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Paper: cond-mat/0609600
Date: Sat, 23 Sep 2006 04:08:54 GMT (87kb)
Title: On-site number statistics of ultracold lattice bosons
Authors: Barbara Capogrosso-Sansone, Evgeny Kozik, Nikolay Prokof'ev, Boris
Svistunov
Comments: 9 pages, 4 figures
Subj-class: Statistical Mechanics; Other
\\
We study on-site occupation number fluctuations in a system of interacting
bosons in an optical lattice. The ground-state distribution is obtained
analytically in the limiting cases of strong and weak interaction, and by means
of exact Monte Carlo simulations in the strongly correlated regime. As the
interaction is increased, the distribution evolves from Poissonian in the
non-interacting gas to a sharply peaked distribution in the Mott-insulator (MI)
regime. In the special case of large occupation numbers, we demonstrate
analytically and check numerically that there exists a wide interval of
interaction strength, in which the on-site number fluctuations remain Gaussian
and are gradually squeezed until they are of order unity near the superfluid
(SF)-MI transition. Recently, the on-site number statistics were studied
experimentally in a wide range of lattice potential depths [Phys. Rev. Lett.
\textbf{96}, 090401 (2006)]. In our simulations, we are able to directly
reproduce experimental conditions using temperature as the only free parameter.
Pronounced temperature dependence suggests that measurements of on-site atom
number fluctuations can be employed as a reliable method of thermometry in both
SF and MI regimes.
\\ ( http://arXiv.org/abs/cond-mat/0609600 , 87kb)
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Paper: cond-mat/0609604
Date: Sat, 23 Sep 2006 12:54:11 GMT (27kb)
Title: Mixture of bosonic and spin-polarized fermionic atoms in an optical
lattice
Authors: Lode Pollet, Corinna Kollath, Ulrich Schollwoeck, Matthias Troyer
Comments: 4 pages, 5 figures
Subj-class: Other; Statistical Mechanics
\\
We investigate the properties of Bose-Fermi mixtures for experimentally
relevant parameters in one dimension using numerical methods. We find that the
strong attractive interaction between the bosons and fermions leads to the
creat ion of polaronic particles. The effect of the fermions on the bosons is
not only to deepen the parabolic trapping potential, but also to reduce the
bosonic repulsion. This reduction would theoretically lead to an increase in
the bosonic visibility. The opposite was observed however in the experimental
87Rb - 40K systems, most likely due to a sharp rise in temperature.
\\ ( http://arXiv.org/abs/cond-mat/0609604 , 27kb)
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Paper: cond-mat/0609621
Date: Mon, 25 Sep 2006 01:29:15 GMT (3kb)
Title: Comments on ``Observation of Strong Quantum Depletion in a Gaseous
Bose-Einstein Condensate" [cond-mat/0601184]
Authors: Sang-Hoon Kim
Comments: 1 page, 0 figure
Subj-class: Statistical Mechanics
\\
We suggested a method to estimate the quantum depletion of interacting Bose
particles confined by a three dimensional harmonic trap.
\\ ( http://arXiv.org/abs/cond-mat/0609621 , 3kb)
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Paper: cond-mat/0609632
Date: Mon, 25 Sep 2006 12:01:31 GMT (7kb)
Title: Feshbach Resonance and Growth of a Bose-Einstein Condensate
Authors: C. Yuce and A. Kilic
Comments: 4 pages
Subj-class: Other
Journal-ref: Phys. Rev. A 74, 033609 (2006)
\\
Gross-Pitaevskii equation with gain is used to model Bose Einstein
condensation (BEC) fed by the surrounding thermal cloud. It is shown that the
number of atoms continuously injected into BEC from the reservoir can be
controlled by applying the external magnetic field via Feshbach resonance.
\\ ( http://arXiv.org/abs/cond-mat/0609632 , 7kb)
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Paper: quant-ph/0609189
Date: Mon, 25 Sep 2006 13:01:23 GMT (95kb)
Title: Quantum storage and cloning of light states in EIT-like medium
Authors: A. P. Alodjants, S. M. Arakelian
Comments: 13 pages, 4 postscript figures, uses ws-ijmpb.cls
Journal-ref: Int. J. of Modern Physics B, 20 (2006) 1593-1605
DOI: 10.1142/S0217979206034145
\\
In the paper we consider a new approach for storage and cloning of quantum
information by three level atomic (molecular) systems in the presence of the
electromagnetically induced transparency (EIT) effect. For that, the various
schemes of transformation into the bright and dark polaritons for quantum
states of optical field in the medium are proposed. Physical conditions of
realization of quantum nondemolition (QND) storage of quantum optical state are
formulated for the first time. We have shown that the best storage and cloning
of can be achieved with the atomic ensemble in the Bose-Einstein condensation
state. We discuss stimulated Raman two-color photoassociation for experimental
realization of the schemes under consideration.
\\ ( http://arXiv.org/abs/quant-ph/0609189 , 95kb)
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Paper: physics/0609203
Date: Fri, 22 Sep 2006 22:37:28 GMT (254kb)
Title: Exploring the phase space of the quantum delta kicked accelerator
Authors: G. Behinaein, V. Ramareddy, P. Ahmadi, and G.S. Summy
Comments: 4 pages, 5 figures
Subj-class: Atomic Physics
\\
We experimentally explore the underlying pseudo-classical phase space
structure of the quantum delta kicked accelerator. This was achieved by
exposing a Bose-Einstein condensate to the spatially corrugated potential
created by pulses of an off-resonant standing light wave. For the first time
quantum accelerator modes were realized in such a system. By utilizing the
narrow momentum distribution of the condensate we were able to observe the
discrete momentum state structure of a quantum accelerator mode.
\\ ( http://arXiv.org/abs/physics/0609203 , 254kb)
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Paper: physics/0609220
Date: Mon, 25 Sep 2006 05:35:15 GMT (76kb)
Title: Experimental verification of minima in excited long-range Rydberg states
of Rb_2
Authors: Chris H. Greene, Edward L. Hamilton, Heather Crowell, Cedomil Vadla,
and Kay Niemax
Comments: 3 figures, 5 pages in two-column format
Subj-class: Atomic Physics; Chemical Physics
\\
Recent theoretical studies with alkali atoms A$^{\ast}$ excited to high
Rydberg states predicted the existence of ultra long-range molecular bound
states. Such excited dimers have large electric dipole moments which, in
combination with their long radiative lifetimes, make them excellent candidates
for manipulation in applications. This letter reports on experimental
investigations of the self-broadening of Rb principal series lines, which
revealed multiple satellites in the line wings. The positions of the satellites
agree quantitatively with theoretically-predicted minima in the excited
long-range Rydberg states of Rb$_2$.
\\ ( http://arXiv.org/abs/physics/0609220 , 76kb)
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Paper: cond-mat/0609642
Date: Mon, 25 Sep 2006 21:50:00 GMT (585kb)
Title: Dynamics of vortex matter in rotating two-species Bose-Einstein
condensates
Authors: S. J. Woo, S. Choi, L. O. Baksmaty, and N. P. Bigelow
Subj-class: Other
\\
In a rotating two-component Bose-Einstein condensate (BEC), the traditional
triangular vortex lattice can be replaced by a rectangular vortex lattice or
even a structure characterized in terms of vortex sheets, depending on the
interspecies interactions. We study the dynamics of this system by analyzing
the Bogoliubov excitation spectrum. Excitations familiar to BEC vortex systems
are found such as Tkachenko modes, hydrodynamic modes and surface waves,
however, the complex two-component morphology also gives rise to new phenomena
including shear flow between vortex sheets.
\\ ( http://arXiv.org/abs/cond-mat/0609642 , 585kb)
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Paper: cond-mat/0609661
Date: Tue, 26 Sep 2006 09:58:33 GMT (343kb)
Title: Convergence rate of dimension reduction in Bose-Einstein condensates
Authors: Weizhu Bao, Yunyi Ge, Dieter Jaksch, Peter A. Markowich and Rada M.
Weishaeupl
Comments: 27pages; 9 figures
Subj-class: Materials Science
\\
In this paper, we study dimension reduction of the three-dimensional (3D)
Gross-Pitaevskii equation
(GPE) modelling Bose-Einstein condensation under different limiting
interaction and trapping frequencies parameter regimes.
Convergence rates for the dimension reduction of 3D ground state and dynamics
of the GPE in the case of disk-shaped condensation and cigar-shaped
condensation are reported based on our asymptotic and numerical results. In
addition, the parameter regimes in which the 3D GPE cannot be reduced to lower
dimensions are identified.
\\ ( http://arXiv.org/abs/cond-mat/0609661 , 343kb)
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Paper: cond-mat/0609668
Date: Tue, 26 Sep 2006 14:17:03 GMT (13kb)
Title: Exact results for the Spectra of Bosons and Fermions with Contact
Interaction
Authors: Stefan Mashkevich (Schrodinger, New York / University, Kiev), Sergey
Matveenko (Landau Inst., Moscow), St\'ephane Ouvry (LPTMS, Orsay)
Comments: 16 pages, LaTeX 2e
Subj-class: Mesoscopic Systems and Quantum Hall Effect; Strongly Correlated
Electrons
\\
An N-body bosonic model with delta-contact interactions projected on the
lowest Landau level is considered. For a given number of particles in a given
angular momentum sector, any energy level can be obtained exactly by means of
diagonalizing a finite matrix: they are roots of algebraic equations. A
complete solution of the three-body problem is presented, some general
properties of the N-body spectrum are pointed out, and a number of novel exact
analytic eigenstates are obtained. The FQHE N-fermion model with
Laplacian-delta interactions is also considered along the same lines of
analysis. New exact eigenstates are proposed, along with the Slater
determinant, whose eigenvalues are shown to be related to Catalan numbers.
\\ ( http://arXiv.org/abs/cond-mat/0609668 , 13kb)
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Paper: quant-ph/0609202
Date: Tue, 26 Sep 2006 19:49:29 GMT (45kb)
Title: Loschmidt echo in the Bose-Hubbard model: turning back time in an
optical lattice
Authors: Fernando M. Cucchietti
Report-no: LA-UR-06-5903
\\
I show how to perform a Loschmidt echo (time reversal) in the Bose-Hubbard
model implemented with cold bosonic atoms in an optical lattice. The echo is
obtained by applying a linear phase imprint on the lattice and a change in
magnetic field to tune the boson-boson scattering length through a Feshbach
resonance. I discuss how the echo can measure the fidelity of the quantum
simulation, the intensity of an external potential (e.g. gravity), or the
critical point of the superfluid-insulator quantum phase transition.
\\ ( http://arXiv.org/abs/quant-ph/0609202 , 45kb)
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Paper: quant-ph/0609178
Date: Fri, 22 Sep 2006 20:00:22 GMT (406kb)
Title: Coexistence of unlimited bipartite and multipartite
Einstein-Podolsky-Rosen entanglement
Authors: Gerardo Adesso, Marie Ericsson, Fabrizio Illuminati
Comments: 12 pages + 3 figures
Subj-class: Quantum Physics; Mathematical Physics; Optics; Other
\\
Quantum mechanics imposes 'monogamy' constraints on the sharing of
entanglement. We show that, despite these limitations, entanglement can be
simultaneously present in unlimited two-body and many-body forms in continuous
variable systems. This is demonstrated in experimentally producible multimode
states of light fields or atomic ensembles, which therefore enable infinitely
more freedom in the distribution of information, as opposed to system of qubits
where such entanglement structure is impossible. This is a central finding for
the quantification, understanding and potential exploitation of shared quantum
correlations, and may lead to novel realisations of robust multiparty
communication networks and scalable quantum computation.
\\ ( http://arXiv.org/abs/quant-ph/0609178 , 406kb)
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Paper: cond-mat/0609678
Date: Wed, 27 Sep 2006 02:06:00 GMT (284kb)
Title: An efficient and spectrally accurate numerical method for computing
dynamics of rotating Bose-Einstein condensates
Authors: Weizhu Bao, Hanquan Wang
Comments: 21 pages; 7 figures
Subj-class: Other
Journal-ref: J. Comput. Phys., Vol. 217, No. 2, 2006, pp. 612-626
\\
In this paper, we propose an efficient and spectrally accurate numerical
method for computing the dynamics of rotating Bose-Einstein condensates (BEC)
in two dimensions (2D) and 3D based on the Gross-Pitaevskii equation (GPE) with
an angular momentum rotation term. By applying a time-splitting technique for
decoupling the nonlinearity and properly using the alternating direction
implicit (ADI) technique for the coupling in the angular momentum rotation term
in the GPE, at every time step, the GPE in rotational frame is decoupled into a
nonlinear ordinary differential equation (ODE) and two partial differential
equations with constant coefficients. This allows us to develop new
time-splitting spectral (TSSP) methods for computing the dynamics of BEC in a
rotational frame.The new numerical method is explicit, unconditionally stable,
and of spectral accuracy in space and second order accuracy in time. Moreover,
it is time reversible and time transverse invariant, and conserves the position
density in the discretized level if the GPE does. Extensive numerical results
are presented to confirm the above properties of the new numerical method for
rotating BEC in 2D and 3D.
\\ ( http://arXiv.org/abs/cond-mat/0609678 , 284kb)
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Paper: cond-mat/0609681
Date: Wed, 27 Sep 2006 07:11:18 GMT (102kb)
Title: Number Statistics of Ultracold Bosons in Optical Lattice
Authors: Yu Chuan Wen, Jing Yu Gan, Xiancong Lu, Yue Yu
Comments: 5 pages, 4 figures
Subj-class: Strongly Correlated Electrons
\\
We study the number statistics of ultracold bosons in optical Lattice using
the slave particle technique and quantum Monte Carlo simulations. For
homogeneous Bose-Hubbard model, we use the slave particle technique to obtain
the number statistics near the superfluid to normal-liquid phase transition.
The qualitatively behavior agree with the recent experiment probing number
fluctuation [Phys. Rev. Lett. \textbf{96}, 090401 (2006)]. We also perform
quantum Monte Carlo simulations to 1D system with external harmonic trap. The
results qualitatively agree with the experiments.
\\ ( http://arXiv.org/abs/cond-mat/0609681 , 102kb)
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Paper: cond-mat/0609683
Date: Wed, 27 Sep 2006 07:58:21 GMT (287kb)
Title: Bose-Einstein condensates in accelerated double-periodic optical
lattices: Coupling and Crossing of resonances
Authors: D. Witthaut, E. M. Graefe, S. Wimberger, H. J. Korsch
Comments: 12 pages, 17 figures
Subj-class: Other
\\
We study the properties of coupled linear and nonlinear resonances. The
fundamental phenomena and the level crossing scenarios are introduced for a
nonlinear two-level system with one decaying state, describing the dynamics of
a Bose-Einstein condensate in a mean-field approximation (Gross-Pitaevskii or
nonlinear Schroedinger equation). An important application of the discussed
concepts is the dynamics of a condensate in tilted optical lattices. In
particular the properties of resonance eigenstates in double-periodic lattices
are discussed, in the linear case as well as within mean-field theory. The
decay is strongly altered, if an additional period-doubled lattice is
introduced. Our analytic study is supported by numerical computations of
nonlinear resonance states, and future applications of our findings for
experiments with ultracold atoms are discussed.
\\ ( http://arXiv.org/abs/cond-mat/0609683 , 287kb)
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Paper: cond-mat/0609685
Date: Wed, 27 Sep 2006 19:47:21 GMT (274kb)
Title: Criterion for bosonic superfluidity in an optical lattice
Authors: Roberto B. Diener, Qi Zhou, Hui Zhai, and Tin-Lun Ho
Comments: 4 pages, 2 figures
Subj-class: Other
\\
We show that the current method of determining superfluidity in optical
lattices based on a visibly "sharp" bosonic momentum distribution $n({\bf k})$
can be misleading, for even a {\em normal} Bose gas can have a similarly
"sharp" $n({\bf k})$. We show that superfluidity can be detected from the
so-called "'visibility" $(v)$ of $n({\bf k})$ $-$ that $v$ must be 1 within
$O(N^{-2/3})$, where $N$ is the number of bosons. Many current experiments,
however, have interpreted states with $v<1$ as superfluid. Such states are in
fact normal, reflecting strong temperature effects in the system. These normal
states, however, allow one to explore the physics in the quantum critical
regime.
\\ ( http://arXiv.org/abs/cond-mat/0609685 , 274kb)
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Paper: cond-mat/0609692
Date: Wed, 27 Sep 2006 11:48:06 GMT (30kb)
Title: Phase diagram of a dilute fermion gas with density imbalance
Authors: C.-H. Pao, S.-T. Wu, and S.-K. Yip
Comments: Proceeding for M$^2$S-HTSC VIII meeting, July 9-14 2006, Dresden; To
appear in Physica C
Subj-class: Other; Superconductivity
\\
We map out the phase diagram of a dilute two-component atomic fermion gas
with unequal populations and masses under a Feshbach resonance. As in the case
of equal masses, no uniform phase is stable for an intermediate coupling
regime. For majority component heavier, the unstable region moves towards the
BEC side. When the coupling strength is increased from the normal phase, there
is an increased parameter space where the transition is into the FFLO state.
The converse is true if the majority is light.
\\ ( http://arXiv.org/abs/cond-mat/0609692 , 30kb)
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Paper: cond-mat/0609703
Date: Wed, 27 Sep 2006 13:58:13 GMT (62kb)
Title: Coherent control of a self-trapped Bose-Einstein condensate
Authors: C.E. Creffield
Comments: 4 pages, 5 EPS figures
Subj-class: Other
\\
We study the behavior of a Bose-Einstein condensate held in an optical
lattice. We first show how a self-trapping transition can be induced in the
system by either increasing the number of atoms occupying a lattice site, or by
raising the interaction strength above a critical value. We then investigate
how applying a periodic driving potential to the self-trapped state can be used
to coherently control the emission of a precise number of correlated bosons
from the trapping-site. This allows the formation and transport of entangled
bosonic states, which are of great relevance to novel technologies such as
quantum information processing.
\\ ( http://arXiv.org/abs/cond-mat/0609703 , 62kb)
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Paper: cond-mat/0609706
Date: Wed, 27 Sep 2006 14:29:44 GMT (20kb)
Title: Interacting bosons in a nearly-resonant potential well
Authors: Joseph P. Straley and Eugene B. Kolomeisky
Comments: 4 pages, 3 figures
Subj-class: Other
\\
We establish that the ability of a localized attractive potential to bind
weakly-interacting bosons is dramatically enhanced in the vicinity of the
threshold of formation of the single-particle bound-state of the well.
Specifically, for repulsive particles and a super-threshold well the
equilibrium number of bound bosons diverges upon approaching the
single-particle threshold from above. For attractive interactions and a
sub-threshold well a collective bound state always forms for a sufficiently
large number of bosons despite the inability of interparticle attraction alone
to form a two-body bound state.
\\ ( http://arXiv.org/abs/cond-mat/0609706 , 20kb)
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Paper: cond-mat/0609711
Date: Wed, 27 Sep 2006 16:35:46 GMT (20kb)
Title: Superfluidity as a quantum exchange effect
Authors: Yongle Yu
Comments: 5 pages, 4 figures
Subj-class: Statistical Mechanics
\\
We show that superfluidity of a Bose system with a repulsive interaction is a
quantum exchange effect. As the strength of the interaction increases, the
critical velocity is increased and superfluidity is enhanced. Since the
interaction also depletes the Bose-Einstein condensate, Bose-Einstein
condensation and superfluidity are not only independent of each other, but are
affected by the interaction strength in the opposite way.
\\ ( http://arXiv.org/abs/cond-mat/0609711 , 20kb)
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Paper: quant-ph/0609208
Date: Wed, 27 Sep 2006 09:57:49 GMT (221kb)
Title: Continuous transfer and laser guiding between two cold atom traps
Authors: Emiliya Dimova (LAC), Olivier Morizot (LPL), Guillaume Stern (LAC),
Carlos L. Garrido Alzar (LPL), Andrea Fioretti (LAC), Vincent Lorent (LPL),
Daniel Comparat (LAC), H\'{e}l\`{e}ne Perrin (LPL), Pierre Pillet (LAC)
Comments: 10 pages, 8 figures
Proxy: ccsd ccsd-00101449
\\
We have demonstrated and modeled a simple and efficient method to transfer
atoms from a first Magneto-Optical Trap (MOT) to a second one. Two independent
setups, with cesium and rubidium atoms respectively, have shown that a high
power and slightly diverging laser beam optimizes the transfer between the two
traps when its frequency is red-detuned from the atomic transition. This
pushing laser extracts a continuous beam of slow and cold atoms out of the
first MOT and also provides a guiding to the second one through the dipolar
force. In order to optimize the transfer efficiency, the dependence of the
atomic flux on the pushing laser parameters (power, detuning, divergence and
waist) is investigated. The atomic flux is found to be proportional to the
first MOT loading rate. Experimentally, the transfer efficiency reaches 70%,
corresponding to a transfer rate up to 2.7x10^8 atoms/s with a final velocity
of 5.5 m/s. We present a simple analysis of the atomic motion inside the
pushing--guiding laser, in good agreement with the experimental data.
\\ ( http://arXiv.org/abs/quant-ph/0609208 , 221kb)
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Paper: cond-mat/0609725
Date: Thu, 28 Sep 2006 10:13:02 GMT (121kb)
Title: Association of molecules using a resonantly modulated magnetic field
Authors: Thomas M. Hanna, Thorsten Koehler, and Keith Burnett
Comments: 8 pages, 8 figures
Subj-class: Other
\\
We study the process of associating molecules from atomic gases using a
magnetic field modulation that is resonant with the molecular binding energy.
We show that maximal conversion is obtained by optimising the amplitude and
frequency of the modulation for the particular temperature and density of the
gas. For small modulation amplitudes, resonant coupling of an unbound atom pair
to a molecule occurs at a modulation frequency corresponding to the sum of the
molecular binding energy and the relative kinetic energy of the atom pair. An
atom pair with an off-resonant energy has a probability of association which
oscillates with a frequency and time-varying amplitude which are primarily
dependent on its detuning. Increasing the amplitude of the modulation tends to
result in less energetic atom pairs being resonantly coupled to the molecular
state, and also alters the dynamics of the transfer from continuum states with
off-resonant energies. This leads to maxima and minima in the total conversion
from the gas as a function of the modulation amplitude. Increasing the
temperature of the gas leads to an increase in the modulation frequency
providing the best fit to the thermal distribution, and weakens the resonant
frequency dependence of the conversion. Mean-field effects can alter the
optimal modulation frequency and lead to the excitation of higher modes. Our
simulations predict that resonant association can be effective for binding
energies of order $h \times 1$ MHz.
\\ ( http://arXiv.org/abs/cond-mat/0609725 , 121kb)
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Paper: quant-ph/0609214
Date: Wed, 27 Sep 2006 20:51:22 GMT (363kb)
Title: Long-distance teleportation of atomic qubit via optical interferometry
Authors: Y. P. Huang, M. G. Moore
\\
The problem of long-distance teleportation of single-atom qubits via a common
photonic channel is examined within the framework of a Mach-Zender optical
interferometer. As expected, when a coherent state is used as input, a
high-finesse optical cavity is required to overcome sensitivity to spontaneous
emission. However, we find that a number-squeezed light field in a twin-Fock
state can in principle create useful entanglement without cavity-enhancement.
Both approaches require single photon counting detectors, and best results are
obtained by combining cavity-feedback with twin-fock inputs. Such an approach
may allow a fidelity of $.99$ using a two-photon input and currently available
mirror and detector technology. In addition, the present approach can be
conveniently extended to generate multi-site entanglement and entanglement
swapping, both of which are necessities in quantum networks.
\\ ( http://arXiv.org/abs/quant-ph/0609214 , 363kb)
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Updated preprints:
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Paper: cond-mat/0603479
replaced with revised version Fri, 22 Sep 2006 08:27:53 GMT (9kb)
Title: Ground state energy density of a dilute Bose gas in the canonical
transformation
Authors: Hyun Sik Noh, Sang-Hoon Kim, Chul Koo Kim, and Mukunda P. Das
Comments: 5 pages, 0 figure. submitted to Phys. Rev. A
Subj-class: Statistical Mechanics
\\ ( http://arXiv.org/abs/cond-mat/0603479 , 9kb)
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Paper: cond-mat/0609468
replaced with revised version Fri, 22 Sep 2006 09:12:11 GMT (196kb)
Title: Solitons in a trapped spin-1 atomic condensate
Authors: Wenxian Zhang,\"O. E. M\"ustecapl{\i}o\u{g}lu, and L. You
Comments: 8 pages, 8 color eps figures
Subj-class: Other
\\ ( http://arXiv.org/abs/cond-mat/0609468 , 196kb)
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Paper: quant-ph/0508186
replaced with revised version Fri, 22 Sep 2006 08:00:02 GMT (55kb)
Title: Atomic density of an harmonically trapped ideal gas near Bose-Einstein
transition temperature
Authors: Rodolphe Hoppeler (LCFIO), Jose Viana Gomes (LCFIO), Denis Boiron
(LCFIO)
Proxy: ccsd ccsd-00008200
\\ ( http://arXiv.org/abs/quant-ph/0508186 , 55kb)
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Paper: cond-mat/0603340
replaced with revised version Tue, 26 Sep 2006 02:38:03 GMT (25kb)
Title: Calogero-Sutherland gas of ultracold Bose atoms
Authors: Yue Yu
Comments: 4 pages,1 figure,update version
Subj-class: Other; Statistical Mechanics; Mathematical Physics
\\ ( http://arXiv.org/abs/cond-mat/0603340 , 25kb)
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Paper: cond-mat/0604339
replaced with revised version Tue, 26 Sep 2006 09:05:50 GMT (587kb)
Title: Generic Phase Diagram of Fermion Superfluids with Population Imbalance
Authors: K. Machida, T. Mizushima, M. Ichioka
Comments: 5 pages, 5 figures, replaced by the version to appear in PRL
Subj-class: Superconductivity
Journal-ref: Phys. Rev. Lett. 97, 120407 (2006)
\\ ( http://arXiv.org/abs/cond-mat/0604339 , 587kb)
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Paper: cond-mat/0605581
replaced with revised version Wed, 27 Sep 2006 19:57:57 GMT (76kb)
Title: Response to Comment on "Pairing and Phase Separation in a Polarized
Fermi Gas"
Authors: Guthrie B. Partridge, Wenhui Li, Ramsey I. Kamar, Yean-An Liao, and
Randall G. Hulet
Subj-class: Superconductivity; Strongly Correlated Electrons
\\ ( http://arXiv.org/abs/cond-mat/0605581 , 76kb)
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Paper: cond-mat/0607102
replaced with revised version Wed, 27 Sep 2006 11:02:25 GMT (536kb)
Title: Observing the Formation of Long-range Order during Bose-Einstein
Condensation
Authors: Stephan Ritter, Anton \"Ottl, Tobias Donner, Thomas Bourdel, Michael
K\"ohl, Tilman Esslinger
Comments: 4 pages, 4 figures; revised version contains new data on the momentum
distribution of the gas
Subj-class: Statistical Mechanics
\\ ( http://arXiv.org/abs/cond-mat/0607102 , 536kb)
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Paper: quant-ph/0605234
replaced with revised version Wed, 27 Sep 2006 20:35:06 GMT (322kb)
Title: Integration of fiber coupled high-Q silicon nitride microdisks with atom
chips
Authors: Paul E. Barclay, Benjamin Lev, Kartik Srinivasan, Oskar Painter, Hideo
Mabuchi
Comments: Published vesion. Minor changes
Subj-class: Quantum Physics; Optics
Journal-ref: Appl. Phys. Lett. 89, 131108 (2006)
DOI: 10.1063/1.2356892
\\ ( http://arXiv.org/abs/quant-ph/0605234 , 322kb)
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Till next week,
Matt.
-- ========================================================================= Dr M. J. Davis, Senior Lecturer in Physics School of Physical Sciences, email: mdavis_at_physics.uq.edu.au University of Queensland, ph : +61 7 334 69824 Brisbane, QLD 4072, fax : +61 7 336 51242 Australia. http://www.physics.uq.edu.au/people/mdavis/ ========================================================================= Matt's arXiv selection: weekly summary of cold-atom papers from arXiv.org http://www.physics.uq.edu.au/people/mdavis/matts_arXiv/ ========================================================================= Legal stuff: Unless stated otherwise, this e-mail represents only the views of the sender and not the views of the University of Queensland =========================================================================Received on Thu Oct 05 2006 - 15:02:07 EST
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